Ok, dumb question.... will a PCIE 2.1 card work in a PCIE 2.0 mobo? I just built a new system using an ASUS P7P55D-E LX mobo and installed an XFX HD-577A-ZN Radeon HD5770 vid card. Also, should I up the slot on the mobo to the 8X setting (this will also enable the USB3.0)? And finally, this is hooked up to a Samsung 20" monitor and a 46" Toshiba LCD TV, what would be the optimum settings for using this as an entertainment setup playing mostly movies and such?